What is the best practice for testing code to pinpoint a logic error within a script?

What is the best practice for testing code to pinpoint a logic error within a script?
A . Test the code in the W3C code validator.
B. Conduct a manual, line-by-line, code review.
C. Check for console errors when loading the page.
D. Insert watchpoints and comment out code blocks.

View Answer

Answer: D

Explanation:

Commenting out blocks of code, also referred to as isolation testing, is another common debugging practice. If a block of code is suspected to be causing an issue, it can be temporarily commented out to see if the issue persists. If the issue is resolved when the code is commented out, that suggests that the issue lies somewhere within that block of code.

It’s important to note that manual line-by-line code review (Option B) can also be very useful, especially for catching logic errors that automated tools might miss. However, it’s more time-consuming and potentially less precise than systematic debugging with watchpoints and isolation testing, so for the purposes of this question, D is the best answer.